For progressing experiments to the nanowire scale, a nanomanipulation instrument was designed and constructed that interfaces within a scanning electron microscope and allows for real time characterization of individual wires with diameters near 100 nm. The results of mechanical tensile testing and dynamic resonance identification reveal that the Galfenol nanowires behave similarly to the bulk material with the exception of a large increase in ultimate tensile strength. The magnetic domain structure of the nanowires was theoretically predicted and verified with magnetic force microscopy. An experimental methodology was developed to observe the coupling between bending stress and magnetization that is critical for accurate sensing, and the key results indicate that specific structural modifications need to be made to reduce the anisotropy in the nanowires in order to improve the transduction capabilities. A solution to this problem is presented and final experiments are performed.Training, calibration, and maintenance for the SEM were at different times performed by Lance and Jamey of JEOL, under ... I sincerely thank him for recognizing the short time frame and allowing me to finish critical experiments on schedule.
|Title||:||Characterization of Bending Magnetostriction in Iron-gallium Alloys for Nanowire Sensor Applications|
|Author||:||Patrick Ramon Downey|
|Publisher||:||ProQuest - 2008|